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Regnaulfs Experiments.

surface of the mercury.    Both tubes are surrounded by heated
water, whose temperature is shown by thermometer.

Regnault further found, as in Fig.-606, the temperatures and
pressures of saturated steam between 122 and 219, the experi-

ment having since been carried to 432. A is a boiler where
steam is formed, and B a copper sphere containing an artificial
atmosphere, produced by the condensing syringe c. As fast as
steam is formed, it is condensed by water passing from D to E
round the steam pipe; but this is a practical detail Essentially
the pressures in B and A balance, being measured by the open